Toothbrush



- 5, 1942. v P. SPYRA 2,305,451

TOOTHBRUSH Filed Dec. 29, 1939 In van {or Attorneys.

Patented Dec. 15, 1942 roo'rnmwsn Q Paul Spyra, Berlin-Charlottenburg, Germany; vested in the. Alien Property Custodian Application December 29, 1939, Serial No. 311,679

In Germany December 9,1938

6 Claims. ((31. 15-167) The invention relates to tooth brushes. The purpose of the invention is to provide an arrangement of the bristles so as to be well adapted to the form of the teeth and to enable better cleaning of the teeth, especially of the interdentils, than it is possible with tooth brushes or known form and construction.

A further purpose of the invention is to arrange the bristles so as to surround two or more hollow spaces connected with each other. These hollow spaces are able to take up the teeth in such a way that the points-of the bristles will thoroughly clean the most endangered neck of the tooth and the interdentils, and will not press the fur on the teeth into the interdentils. With a tooth brush according to the invention, it is also impossible to injure the surface of the necks of the teeth.

This especially refers to tooth brushes according to the invention, in which the bristles in the bristle crown are quite close to each other, i.e., a closed bristle crown is provided, in contradistinction to an arrangement of the bristles in individual bunches.

Preferably, two bristle crowns are arranged one within the other, adjacent bristles forming from their points an angle with each other. The advantage of this is that the bristle crowns support each other and, therefore, render it more diflicult for the bristles getting bent.

Several constructional examples of a tooth brush according to the invention are illustrated in the accompanying drawing, in which- Fig. 1 is a view of a brush head of a tooth brush according to the invention,

Fig. 2 shows the head of the brush in plan view,

Fig. 3 is a section through the brush head on the line IIIIII of Fig. 2,

Fig. 4 is a diagrammatic view of a somewhat different form of construction,

Fig. 5 is a cross section on the line V-V of Fig. 4,

Figs. 6 to 8 are plan views of three different modifications of the brush arrangement.

The bristle plate I of the brush handle 2 is, in the construction according to Figs. 1 and 2, provided with a bristle crown 3 which, on the side adjacent to the brush handle has an opening 4. The bristles of the bristle crown are arranged in the form of the figure 8, the upper as well as the lower part of the 8 being dimensioned so as to surround one tooth. The 8 of the bristle crown is not closed in the middle but leaves an opening 5 between inwardly extending bristle projections, which opening has the same size as opening i.

The bristles are arranged so as to surround, as will be-seen from Fig. 1, two communicating hollow spaces in the shape of conic frustums. The bristles in the lower part of the 8 may form with the upper part of the 8 a continuous bristle crown, as shown in the constructional example illustrated.

Forproperly cleaning the teeth, it is very important that the bristles in the bristle crown are quite close to each other. This may be achieved in known manner by clamping the bristles together to form a bristle crown. This clamping may, for example, be effected in a metal strip which is then bent, according to the description, to from an 8, and is inserted in the brush head, or, if the 8 is formed by combining two. single bristle crowns arranged closely to each other, by clamping the bristles between two cup-shaped members. The bristles may be put round a wire or a Wire ring between the side portions of. the metal strip or between the cupshaped members. V

In order that the bristles should not so easily get bent in using the tooth brush, the invention provides in a special form of construction two bristle crowns 6, I (Fig. 3), one arranged within the other in such a way that the points of their bristles form an angle. As will be seen from the drawing, adjacent bristles of the bristle crowns of which one surrounds the other, touch at their points but otherwise form an angle. The bristle crown 1 serves as support for the bristle crown 6 and, vice versa, the bristle crown 6 serves as support for the bristle crown 1, according to the direction of the stressing to which the brush is subjected. The constructional form according to Figs. 4 and 5 is identical with the constructional form according to Figs. 1 and 2, with the slight modification of the bristles being arranged substantially vertical on the bristle plate.

The constructional form according to Fig. 6 substantially equals the constructional form according to Figs. 4 and 5, except that at the outer end of the brush at 4a the bristle crown is partly open so that in this place too there are bristle projections 3a extending inwardly. In the simplified constructional forms according to Figs. 7 and 8, there are only two rows of bristles 8, 9 with inwardly extending bristle projections I ll, spaced at a distance in longitudinal direction of the brush in the form shown in Fig. 8.

The tooth brush according to the invention,

1. A tooth brush comprising a handle, a plate on the handle, two rows of bristles on saidplate arranged at a distance from each other, opposed bristle projections extending inwardly of the rows of bristles at the middle of the rows of bristles and at the inner end thereof, the space,

between the bristle projections being" smaller than the maximum distance between the rows of bristles, the rows of bristles adjacent the inner end of the plate and the bristle projections in the middle and at the inner ends of the rows forming a substantially circular space so as to substantially surround cne tooth, and the rows of bristles adjacent the. outer end of the plate and the bristle projections in the middle forming a substantially circular space so as to substantially surround the adjacent tooth.

2. A tooth brush as claimed in claim 1, in which the bristles are arranged vertically.

H 3. A tooth brush as claimed in claim 1, in which the bristles are slightly inclined in an outward direction.

4. A tooth brush comprising a handle, a plate on the handle, two rows of bristles on said plate arranged at a distance from each other, opposed bristle projections extending inwardly of the rows of bristles at the middle of the rows of bristles and at the inner and outer ends thereof, the distance between the bristle projections being smaller than the maximum distance between the rows of bristles, the rows of bristles adjacent the inner end of the plate and the bristle projections in the middle and at the inner end of the rows forming a substantially circular space so as to substantially surround one tooth, and the rows of bristles adjacent the outer end of the plate and the bristle projections in the middle and at the outer end of the rows forming a substantially circular space so as to substantially surround the adjacent tooth.

5. A tooth brush comprising a handle, a plate on the handle, two rows of bristles on said plate arranged at a distance from each other, opposed bristle projections extending inwardly of the rows of bristles at the middle of the rows of bristles and at the inner end thereof, the outer ends of said rows meeting in the form of an arc, the space between the bristle projections being smaller than the maximum distance between the rows, the r'owsof bristles adjacent the inner end of the plate and the bristle projections in the middle and at the inner end of the rows forming a substantially circular space so as to substantially surround one tooth, and the rows of bristles at the outer meeting ends and the bristle projections in the middle of said rows forming a substantially circular space so as to substantially surround the adjacent tooth.

6. A tooth brush comprising a handle, a plate on the handle, two rows of bristles on said plate arranged at a distance from each other and being slightly inclined in an outward direction, opposed bristle projections extending inwardly of the rows of bristles at the middle of the rows of bristles and at the inner end thereof, the outer ends of said rows meeting each other in the form of an arc, the space between the bristle projeotions being smaller than the maximum distance between the rows, the rows of bristles adjacent the inner end of the plate and bristle projections in the middle and at the inner end of the rows forming a substantially circular space so as to substantially surround one tooth, and the rows of bristles at their outer meeting ends and the bristle projections in the middle of said rows forming a substantially circular space so as to substantially surround the adjacent tooth.

PAUL SPYRA. 

